Rotary mill.



N0. 628,|4l. Patented July 4, I899.

- G.- s. EMERICK.

ROTARY MILL.

(Application filed Oct. 11, 1898.) (No Modem 2 Sheets-$het l.

INVENTOI? I V 2 ATTORNEY,

- Patented July 4, I899. G. S. EMERICK.

ROTARY MILL.

(Application filed Oct. 11, 1898.)

2 Sheets-Sheet 2,

(No Model.)

A TTOHNE).

m: norms PzTzRs cq. PHDTO-L'ITHQ. WASNINGTOm D. c.

' UNITED STATES PATENT )rFICE.

GEORGE S. EMERlCK, OF PHILADELPHIA, PENNSYLVANIA.

ROTARY MILL.

SP-EQIIEICATION forming part of Letters Patent No. 628,141, dated July 4, 1899. I

Application filed October 11, 1898. Serial No. 693,219. (No model.)

To all wltonv it may concern:

Be it known that I, GEORGE S. EMERICK, a citizen of the United States, residing in the'city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Rotary Mill, of which the following is specification. a

My invention relates to improvements in that class of rotary-mill machines which consist of a rotating cylindrical casing divided by vertical partitions into compartments,each compartment containing pebbles or small balls which operate by the rotation of the casing to pulverize material as it passes successively through the compartments of said casing.

The object of my improvement is to pro Vide a machine of this description in which the material in passing into each compartment is introduced to the action of the balls at or near the inner circumference of the casing and rises as it is ground between the balls toward the center of the compartment to be reintroduced in the same manner into the adjoining compartment, the movement of the material in process of grinding being always from the circumference toward the center of the casing. I attain this object by the mechanism illustrated in the accompanying drawings, in which Figure 1 is a vertical section of the mill exclusive of the means for rotating the casing. Fig. 2 is an end view of the mill, showing a part of the rotating means. Figs. 3 and 4. are side and end views, respectively, of apart of the rotating means. 'Fig. 5 is a vertical sec tion of the mill on the line 5 5, Fig. 1, show ing the face of the vertical cross-partition and the lengthwise partition in vertical section.

In Fig. 1, A'is a cylindrical casing mounted and rotating upon the inlet and outlet hollow trunnions B and O. The casing is divided into compartments, as shown at F and G, by the partitions D and E, located at right angles to the axis of the casing.

H is a hopper communicating with the inlet-trunnion B. The inlet and outlet trunnions are sustained by the supports I.

The partitions D are double, being composed of the two parts D and D, separated by a slight space. The part D is provided with one or more central perforations, as indicated at J. Between the circumference of the part D and the circumference of the part D is an opening, which may be either a con tinuous' circular slot, as shown in Fig. 1, or separate perforations at intervals around the circumference. The two parts of the partition are attached to one another, but not continuously, in such manner that material in passing from one compartment to the adjoining one enters bythe central perforations J,

passes down through open space above describedinside the partition,and passes into the adjoining compartment through the opening or openings between the circumferences of the parts D and D.

The partition E is provided with one or more central perforations, as at K. The partition Lextends lengthwise through the compartments F, partially dividing the interior of each of the compartments. This partition is shown in vertical section in Fig. 5.

T is an expansion tapered ring, into, which the partition D is wedged and secured by the set-screws U. This provides a tight joint between the partitions and the casing of the mill and at the same time admits of the removal of the partitions for purposes of adjustment or repair.

The compartments F contain pebbles or balls of any suitable hard material. The relative size of the balls and of the perforations and apertures in the partitions should be such that the balls will not pass through them in the operation of grinding and enter the interior of the partitions.

In Fig. 2, I constitutes the support for the inlet-trunnion B. The gear N is actuated by the pulley-wheel O and engages the gear N, which in turn engages the gear N. The gears N and N revolve the shafts P, which extend on either side of and parallel to the I casing A, being furnished with bearings, as shown at R, Figs. 3 and 4. The shafts P carry the sheave-wheels Q, upon which are mounted the sheave-wheel rails M, Fig. 1, attached to the outer circumference of the casing A. The details of this mounting are shown in Figs. 3 and 4:-

The defect hitherto existing in mills of this class has been that the form of the partitions dividing the cylinder into compartments and the relation of their openings were such that the material in its passage through the mill was obliged to pass alternately from center to periphery and from periphery to center of the successive compartments. My invention consists in the improved double partition above described, whereby the material is introduced into each compartment at the periphery and works through the balls always toward the axis of rotation, following the natural law of its movement.

The operation of the rotary mill is as follows: The cylindrical casingAbeing rotated by any suitable means, the material to be pulverized is introduced through the inlet-trunnion B into the compartment F. It is here subjected to the action of the balls or pebbles, between which it works upward toward the center of the compartment and, passing through the central perforations J in the partition D, falls through the space between the parts D and D to the circular opening at the circumference of the partition, whereit passes out into the adjoining compartment and is again subjected to the action of the balls or pebbles while working upward between them in the manner above described. This movement being repeated according to the n umber of compartments in the casing A, the material passes through the central perforations K in the partition E into the compartment G, where it is taken up by the projecting angleirons V, Fig. 1, and guided into the outlettrunnion C. The path taken by the material while passing through the mill is indicated by the arrows in Fig. 1. The length-wise partition L operates as the casing rotates to more completely mix the material with the balls, and thus increases the pulverizing efficiency of the latter.

I am aware that prior to my invention grinding or pulverizing machines have been constructed in which the material is ground by balls while passing through successive compartments in a drum-shaped casing. I therefore do not claim suchacombinationbroadly,

What I do claim as my invention, and desire to secure by Letters Patent, is

1. In combination in a rotary mill, a casing having a feed-inlet and an outlet for the ground product, a double partition dividing said casing at right angles to the axis of the latter into reducing-compartments, said double partition consisting of two slightlyseparated heads the space between said heads forminga non-reducinginteriorin said double partition, the first head, namely, that nearest the feed-inlet, having central openings and the second head, namely, thatnearest the outlet for the ground product having peripheral openings; the movement of material from the reducing-com partment nearest the feed-inlet into theimmediately-adjoining reducing-compartment being through the central openings in the first head, thence through the non-reducing interior between the first and second heads and lastly through the peripheral openings in the second head, and means for rotating said casing, substantially as described.

2. In combination with a rotary-mill casing having an inlet and outlet and means for retating said casing, of a double partition dividing said easing into grinding-compartments, said double partition having a nongrinding interior space between its separated heads, adapted, as between any two, adjoining grinding-compartments, to, receive material at the center of the grinding-compartment nearest the inlet and discharge it into the immediately-adjoining grinding-compartment at the periphery thereof, substantially as described.

3. In combination in arotary mill containing grinding-compartments, a double partition having a non-grinding interior space between its separated heads, adapted tov receive material in its passage through the mill, from the center of one grinding-compartment and discharge it into the immediately-adjoining grinding-compartment at the periphery thereof, substantially as described.

GEORGE S. EMERICK.

Witnesses:

E. LAMMOT, .H. Bovnn SCHERMERHORN. 

